Fsc part 2 online preparation for chemistry chapter 3 (group IIIA and Group IVA Elements)

Online Short Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

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Chemistry - 12th Class Chemistry Chapter 3 Short Questions Preparation

Question # 1

Describe composition and used of chemical garden?

  • Ans 1: When crystals of soluble coloured salts like nickle chloride,ferrous sulphate,cooper sulphate or cobalt nitrate,etc,are placed in a solution of sodium silicate,they produced a very beautiful growth,like plant,which is called chemical garden.
  • Ans 2: Use:The chemical garden relies on the fact that most transition metal silicate are insoluble in water and are coloured.
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

12th Class Chemistry Chapter 3 Short Questions Preparation - Set 1

Question # 1

Describe composition and used of chemical garden?

  • Ans 1: When crystals of soluble coloured salts like nickle chloride,ferrous sulphate,cooper sulphate or cobalt nitrate,etc,are placed in a solution of sodium silicate,they produced a very beautiful growth,like plant,which is called chemical garden.
  • Ans 2: Use:The chemical garden relies on the fact that most transition metal silicate are insoluble in water and are coloured.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 2

Question # 1

Why Boric acid cannot be titrated by NaOH?

  • Ans 1: Boric acid is partially neutralized by caustic soda to give borax so,boric acid cannot be titrated by NaOH.
    4H3BO3+ 2HaOH------->Na2B4O7+ 7H2O
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 3

Question # 1

How borax is commercially prepared?Give two methods of preparation.

  • Ans 1: i) Borax is prepared by treating a hot solution of boric acid with proper amount of soda ash:
    4H3BO3+ Na2CO3--------> Na2B4O7+ 6H2O + CO2
  • Ans 2: ii) Borax is almost exclusively obtained from calcium borate.Finely
    powderedcolemanite is boiled with Na2CO3solution.When CaCO3precipitates out and a mixture of borax and sodium metaborate is formed.
    4Ca2B6O11+ 2Na2CO3------->2CaCO3+ Na2B4O7+ 2NaBO2
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 4

Question # 1

Aqueous solution of borax is alkaline in nature.Justify the statement.

  • Ans 1: Aqueous solution is alkaline in nature due to hydrolysis.
    Na2B4O7+ 7H2O------->2NaOH +4H3BO3
    Borax Strong alkali Weak acid
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 5

Question # 1

Write four uses of Sodium Silicate?

  • Ans 1: i) It is used as filler for soap in soap industry.
  • Ans 2: ii) It is used in textile as a fire proof.
  • Ans 3: ii) It is used in textile as a fire proof.
  • Ans 4: iii) It is used as furniture polish
  • Ans 5: iv) It is used in calico printing.
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12th Class Chemistry Chapter 3 Preparation

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